She may pop out other things these days, but 365 days ago, Britney Spears spawned another Kevin Federline tyke for the worldto see. The singer gave birth to the couple’s second son via C-section and, for six weeks, the kid’s name was erroneously reported to be Sutton Pierce.

Apparently not up for giving their sons matching initials even though they weighed the same at birth (6 lbs 11 oz.) and almost share the same birthday — Irish twin Sean Preston was born Sept. 14, 2005 — mom and dad opted for the double power of J.

While they announced Sean’s moniker on Britney’s Web site, the duo laid low with Jayden’s, playing the name game for more than a month. The kid’s real name was only unveiled when the birth certificate was officially filed.

Speaking of laying low, Jayden missed out on a cover story while Sean’s an age-old pro at photo shoots by now.